Altra Running, also known as ALTRA Footwear or Altra, is an American company engaged in the design, development, marketing, and sales of road running, trail running, and general footwear. Altra has been ranked in the top 10 brands in “run specialty” and number 4 for trail running.
In 2016, the company started to manufacture running and hiking apparel with a line of jackets, shorts, shirts, and socks. Altra developed a backless windbreaker that can be easily slipped on over a backpack or hydration pack during long distance running. Wikipedia